SU1732120A1 - Air flow rate control valve - Google Patents

Abstract

The invention relates to ventilation. The purpose of the invention is to reduce the loss of kinetic energy when regulating the flow of air in the duct system. The valve consists of a rectangular case, partitions located along the axis of the regulator along the entire height of the case, which divide the air flow into several hermetic channels and are carriers of flexible elastic plates that overlap the flow area of the regulator and have the angle of inclination of the longitudinal axis 7 & deg. This ensures optimum flow alignment and reduced kinetic energy loss. 4 il.

Description

The invention relates to ventilation and can be used both in industrial ventilation and in mechanical engineering and aircraft construction.

A known valve for controlling air flow (ed. No. 1151779, cl. F 24 F 13/08), which has one cantilever flexible element for adjusting the cross section of a rectangular duct.

However, in such a valve behind the flexible element, a sudden expansion of the air flow is formed, which entails greater turbulence and loss of kinetic energy, aerodynamic noise. During one revolution of the actuator, the cross section changes by a thread pitch, which is inconvenient and does not allow for quick adjustment of the air flow. The valve is designed to work in the air duct system in only one direction of the air flow.

To regulate the flow of air, the closest to the invention is a device for regulating the environment, consisting of a housing, inside which two elastic plates (1) work through the driving system of levers to change the flow area of the duct.

The disadvantage of this device is that two elastic plates can effectively work in air ducts of only a small cross section, since with relatively large cross sections, with a small air flow a large difference in the dimensions of the passage sections is formed, which causes large turbulence and loss of kinetic energy of the flow noise.

The aim of the invention is to reduce the kinetic energy loss of the flow in the valve for air regulation.

The goal is achieved by dividing the valve to control the flow of air by flexible elements and partitions placed parallel to the base of the body and dividing it into airtight cavities in which the flexible elements are installed, the latter being interconnected with partitions. Angle Range

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the inclination of the flexible elements relative to the partitions is an average angle of 7 °.

The proposed valve allows one to reduce the kinetic energy loss of the flow, since the average inclination angle of the elastic plates when regulating the flow of 7 ° is theoretically optimal, at which separation from the flow walls does not occur and has a lower stroke completeness ratio.

Figure 1 shows a valve for controlling the flow of air, top view (without a cap); Fig. 2 shows the attachment points of the elastic plates to the plate-nut (type A in Fig. 1); FIG. 3 is a plot of flow rates inside the valve without additional partitions; figure 4 is a plot of flow rates inside the valve with the proposed division into several channels.

The air flow control valve consists of a rectangular body 1, which forms part of the air duct, partitions 2, which are located along the axis along the entire height of the body, divide the air flow into several hermetic ducts and carry flexible elastic plates 3 . The number of partitions 2 and plates 3 depends on the size of the section of the duct. The elastic flexible plates 3 are fixed at one end to the housing 1 and to the bulkheads 2 with the slats 4, providing a free run, the other end rigidly to the nut plates 5 of the driving screw 6. For sealing to the elastic plates, their contact with the body and the partition Soft pads 7 are glued to the body. The drive screw 6 is attached to the housing, resting on the sleeves 8.

The valve for regulating the flow of air works as follows.

When the drive screw 6 is rotated, the elastic flexible plates 3 begin to move in the amount directly proportional to the thread pitch, changing the flow area of the duct and thereby changing the amount of air supplied. In the air flow inside the duct, there is no sudden expansion and contraction in the valve, i.e. the effect of speed equalization is achieved with exactly the longitudinal dividing of the flow by partitions and elastic plates into several hermetic flow channels, with an angle of inclination of the elastic plates relative to the axis of not more than 14 °, since at such angles of inclination 6-8 °

the walls of the rectangular diffuser do not occur, and the angle of 7 ° is the average optimum in the proposed construction, which means that the total angle of inclination of the elastic plates (with full overlap of the air regulator section) is 7 ° -2г14 °. In addition, with tilt angles of 6-8 °, the lowest coefficient of impact completeness,

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hence less loss of kinetic energy.

For the specific manufacture of a valve, various materials and technologies can be used to regulate the flow of air, for example: the housing and partitions can be made of structural steel; elastic plates made of plastic or spring steel; gaskets - made of felt, polyurethane foam, flannel, rubber; drive, plate-nuts, supports - also made of steel; permanent joints should be provided with welding, rivet, glue; detachable - bolts, screws.

As can be seen from the above-described valve design for controlling air flow, the introduction of a series of longitudinal barriers with elastic plates will clearly reduce the loss of kinetic energy in the air flow system and its aerodynamic noise, due to the reduction of its turbulence, it is convenient to change the cross section of the regulator, to ensure the overlap density air flow.

This design is relatively simple to manufacture and can be commercially available.

Claims (1)

Invention Formula A valve for controlling the flow of air, comprising a housing, a flexible element located in the housing and an actuator interconnected with it, made in the form of a screw fixed in the housing and mounted on a screw nut rigidly connected with a flexible element, so that In order to reduce the kinetic energy loss of the air flow, it additionally contains flexible elements and partitions placed parallel to the base of the case and dividing it into hermetic cavities in which flexible elements are installed, the latter taking imosv are associated with septa, and the variation range of inclination angle of the flexible elements with respect to the partitions between 0 and 14 °. Bu3fi 9g Z X V S / J S S S f f S / / / / f FIG. 3 2d / / / //: zz2izz: dg 4